Bad Company (stylized in all caps) is a Japanese manga series written and illustrated by Tooru Fujisawa.
Sakura tells Ryuji that Onizuka is not the kind of person to be interested in power or who is better, he only wants to have a good time with his friends.
It turns out that the Skull Gang also had their eyes set on the bike, and so have waited for it to be repaired so they can sell it at a good price.
The boys have just found a porn magazine vending machine, and are trying to be bold enough to go and buy one, but to no avail, as somebody always passes by.
That night they go driving with the Running Wild Angels, everybody is very surprised, Onizuka is jealous and Ryuji leads the way.
The police and ambulance arrive, and Natsuki willingly goes with them to serve her time in jail, asking Ryuji to wait for her to get out so they can ride on the CBX together.
In the final chapter, having fixed up and taken care of the bike, Ryuji gets a card from Natsuki telling him that she was released because Nezu's injury was not serious, and she is now working at a bar in Kichijōji.